<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1121643
-->
<head>
  <title>Test for Bug 1121643</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/SpawnTask.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1121643">Mozilla Bug 1121643</a>
<span id="mono" style="font-family: monospace; font-size: 64px;">M</span>
<span id="sans" style="font-family: sans-serif; font-size: 64px;">M</span>
<span id="serif" style="font-family: serif; font-size: 64px;">M</span>
<div id="content" style="display: none">

</div>
<script class="testbody" type="application/javascript;version=1.7">

/** Test for Bug 1121643 **/

const DOMUtils =  SpecialPowers.Cc["@mozilla.org/inspector/dom-utils;1"]
                               .getService(SpecialPowers.Ci.inIDOMUtils);

// Given an element id, returns the first font face name encountered.
let fontUsed = id => {
  let element = document.getElementById(id),
      range = document.createRange();
  range.selectNode(element);
  return DOMUtils.getUsedFontFaces(range).item(0).CSSFamilyName;
}

// A map of the default mono, sans and serif fonts, obtained when
// whitelisting is disabled.
const fonts = { mono : fontUsed("mono"),
                sans : fontUsed("sans"),
                serif : fontUsed("serif") };

// Set the font whitelist to contain none, some, or all of the
// default mono, sans, and serif fonts. Check that the rendering
// of our three test elements uses only fonts present in the
// whitelist.
let testFontWhitelist = function* (useMono, useSans, useSerif) {
  let whitelist = [];
  if (useMono) {
    whitelist.push(fonts.mono);
  }
  if (useSans) {
    whitelist.push(fonts.sans);
  }
  if (useSerif) {
    whitelist.push(fonts.serif);
  }
  yield SpecialPowers.pushPrefEnv({"set": [["font.system.whitelist",
                                            whitelist.join(", ")]]});
  // If whitelist is empty, then whitelisting is considered disabled
  // and all fonts are allowed.
  info("font whitelist: " + JSON.stringify(whitelist));
  let whitelistEmpty = whitelist.length === 0;
  is(useMono || whitelistEmpty, fontUsed("mono") === fonts.mono,
     "Correct mono whitelisting state; got " + fontUsed("mono") + ", requested " + fonts.mono);
  is(useSans || whitelistEmpty, fontUsed("sans") === fonts.sans,
     "Correct sans whitelisting state; got " + fontUsed("sans") + ", requested " + fonts.sans);
  is(useSerif || whitelistEmpty, fontUsed("serif") === fonts.serif,
     "Correct serif whitelisting state; got " + fontUsed("serif") + ", requested " + fonts.serif);
}

// Run tests to confirm that only whitelisting fonts are present in a
// rendered page. Try turning mono, sans, and serif off and on in
// every combination.
add_task(function* () {
  for (let useMono of [false, true]) {
    for (let useSans of [false, true]) {
      for (let useSerif of [false, true]) {
        yield testFontWhitelist(useMono, useSans, useSerif);
      }
    }
  }
});

</script>
</body>
</html>
